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Abstract:
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ABSTRACTTHE EFFECT OF DISPLACEMENT CONTROL LOADING HISTORIES ON GENRAL CONNECTING SURFACES USING FINITE ELEMENT ANALYSISSanjog Sabnis , M .S .The University of Texas at Arlington , 2008Supervising Professor : Ali Abolmaali Displacement loading history provided by the AISC Seismic Provision 2002 is commonly used for experimental testing and analytical modeling of beam -to -column steel connection to stimulate the seismic effect . However , the basis for the above loading history is not documented in the literature . Thus , this study developed 25 cyclic load cases by varying the frequency and magnitude of the AISC -2002 loading within a predefined envelops . The 25 load cases are obtained from five different load sets in which the concept of uniform and non -uniform frequencies and amplitude are utilized . All the load cases are limited to the displacement equivalent to the AISC -2002 story drift recommendation of 0 .06 rad . The cyclic load cases were applied to the simple connecting surfaces consisting of : welded shear , single -bolted shear , double -bolted shear , and4 -bolt tee -hanger . Also a typical 4 -bolt extended end -plate connection was considered . The 3 -D finite element model (FEM ) of the above connections were developed by considering material , geometric , and contact non -linearity's for cyclic plasticity -based analysis of the selected connection . Parametric study was conducted by varying the force and geometric related parameters of the connections which were then subjected to the developed loading cases . During the parametric study , the contact algorithm and element type were also varied in order to identify their effect on the analysis results . In addition , a load control loading history which was reported in the literature was used for comparison purpose . The areas under the outer loops of the hysteresis loops were calculated to represent the response . This area signifies the energy dissipation characteristics of each selected connection . The percentage difference of each parametric case subjected to different cyclic displacement loading history is documented and reported . |